Svelte

Svelte is an open-source JavaScript frontend framework created by Rich Harris in 2016, now developed by the Svelte team and maintained under the Svelte Society, distinguished from React, Vue, and Angular by its compile-time approach that eliminates the virtual DOM entirely, generating highly optimized vanilla JavaScript at build time that surgically updates the DOM when state changes, resulting in smaller bundle sizes, faster execution, and less memory consumption compared to virtual DOM diffing approaches, adopted by companies including Spotify, The New York Times, Razorpay, GoDaddy, and Rakuten for production web applications. The compile-time optimization means the framework itself ships almost no runtime code to the browser, with the compiler transforming component definitions into efficient imperative DOM manipulation code, resulting in bundle sizes often ten times smaller than equivalent React applications and startup times measured in kilobytes rather than hundreds of kilobytes, particularly beneficial for performance-sensitive applications, low-end devices, and embedded web views. The reactive programming model uses the dollar sign store contract and reactive declarations with the dollar colon syntax, enabling automatic dependency tracking without explicit subscription management, while the component authoring experience uses a single file format with HTML markup, JavaScript logic in a script tag, and scoped CSS styles. The transitions and animations API provides declarative enter and exit animations with built-in fade, slide, scale, and fly transitions. The context API enables component tree data sharing. The SvelteKit meta-framework provides routing, server-side rendering, and deployment. Designed for frontend developers seeking performance and developer experience.